Osteogenesis imperfecta is a condition of brittle bones, low muscle mass, and lax joints and ligaments. There are several types of this condition. Specific symptoms depend on the specific type and may include: 1  Blue or gray tint to the whites of the eyes. 2  Thin skin. 3  Curved spine. 4  Breathing problems. 5  Hearing loss.
Ashford Black Marble is the name given to a dark limestone, quarried from mines near Ashford-in-the-Water, in Derbyshire, England.Once cut, turned and polished, its shiny black surface is highly decorative. Ashford Black Marble is a very fine-grained sedimentary rock, and is not a true marble in the geological sense.It can be cut and inlaid with other decorative stones and minerals, using a technique known as pietra dura. Derby Museum has a diagram of Ecton Hill made from Ashford Black Marble and other minerals.shford Black Marble is a very fine-grained sedimentary rock, and is not a true marble in the geological sense.
Marble is formed by the metamorphism of limestone. Although it is usually white to gray in color, it often has irregularly colored marks due to the presence of impurities such as silica and clay. Marble is used especially in sculpture and as a building material.